v3.26.1
Related party transactions - Transactions with Mudrick capital and Stephen Fitzpatrick (Details)
£ in Thousands, $ in Millions
1 Months Ended 6 Months Ended
Jun. 26, 2026
USD ($)
May 27, 2026
USD ($)
May 20, 2026
USD ($)
Apr. 20, 2026
USD ($)
Dec. 15, 2021
USD ($)
Jun. 26, 2026
tranche
Jun. 30, 2026
GBP (£)
Jun. 30, 2025
GBP (£)
Dec. 31, 2025
GBP (£)
Dec. 31, 2024
Disclosure of transactions between related parties [line items]                    
Fair value movements             £ 108,272      
Proceeds from issuance of Convertible Senior Secured Notes to related party             7,719      
Financial liabilities at fair value through profit and loss             93,444   £ 188,813  
Convertible Senior Secured Notes                    
Disclosure of transactions between related parties [line items]                    
Fair value movements             112,989      
Proceeds from issuance of Convertible Senior Secured Notes to related party | $         $ 192          
Convertible Senior Secured Notes, additional facility under third supplemental indenture                    
Disclosure of transactions between related parties [line items]                    
Maximum value of additional convertible notes issuable | $       $ 50            
Mudrick                    
Disclosure of transactions between related parties [line items]                    
Other related parties, anti-dilution provision, related party's right of ownership after any awards are issued                   20.00%
Mudrick | Convertible Senior Secured Notes                    
Disclosure of transactions between related parties [line items]                    
Fair value movements             112,989 £ 258,719    
In-kind interest paid and accrued             6,956 5,782    
Mudrick | Convertible Senior Secured Notes, additional facility under third supplemental indenture                    
Disclosure of transactions between related parties [line items]                    
Term of facility       1 year            
Number of tranches under facility drawn during the period | tranche           2        
Proceeds from issuance of Convertible Senior Secured Notes to related party | $ $ 5   $ 5              
Maximum value of additional convertible notes issuable | $       $ 50            
Mudrick | Convertible Senior Secured Notes, additional facility under third supplemental indenture, tranche III                    
Disclosure of transactions between related parties [line items]                    
Proceeds from issuance of Convertible Senior Secured Notes to related party | $   $ 5                
Financial liabilities             0      
Imagination Industries Investments Ltd                    
Disclosure of transactions between related parties [line items]                    
Services received, related party transaction             114 151    
Amount outstanding             £ 57 £ 37